Press with duplicate molds.



` C. F. BURROUGHS. PRESS WITH DUPLICATE MoLDs.

i APPLICATION FILED MAYIO. 1915. LMQU.

4 SHEETS-SHEET 1.

Patented Dec. 12, 1916.

C. F. BURHOUGHS. PRESS WITH DUPLICATE MOLDS. APPLICATION 'HLED'MAY lo. |915.

Patented Dec. l2, 1916.

4 SHEETS-SHEET 2.

@2f j @f C. F. BURROUGHS. PRESS WITH DUPLICATE MOLDS. APPLICATION FILED. MAY I0. 1915.

Patented Dec. 12,1916.

4 SHEETS-SHEET 3.

K11/www0" I m awww/5M C. F. BURROUGHS. PRESS WITH DUPLICATE IVIOLDS. APPLICATION FILED MAY I0, 1915.

4 T E E H A S T E E H S 4 yio CHARLES n nnnnonens, or neer enanas, nnwarnnsnr.

PRESS WITH DUPLICTE MOLDS.

nacen.

Speeication of Letters Patent. Pabttemtgdl Dcc, 112, lllfll.,

Application filed May 10, 1915. Serial No. 27,036.

lthe following specification and the accompanying drawings, forming a part of the same.

This invention relates to an improved means of operating duplicate molds alternately in connection with a single pressingdie, the invention being carried out in an upright press having a horizontal press-bed upon which a slide can be mounted to move across the press-bed and provided with mold-carriers near its opposite ends upon which molds can be detachably supported. rlhe slide is movable by hand-gearing, and stops are provided vto set the molds alternately below the die.

The invention relates partly to special means of operating an ejector in the. center of each mold-carrier so that it may operate in any mold which is applied to such carrier..

rl`he 'press is provided with a plunger movable to and from the p-ress-bed, the plunger carrying a platen with face transverse to the movement of the plunger, and j the die being secured detachably upon the` platen so as to be changed when molds of various characters are applied to the moldcarriers.

rlFhe plunger and platen require a considerable retracting movement whenV changing the die or molds, but means is provided for limiting the retracting movement ofthe platen after each i molding Operation, to merely permit the lateral sliding of the molds from beneath the die, thus" saving much time in theopening and closing of the press and materially increasing its operative capacity.

rlFhe invention will be understood by ref- `erence to the annexed drawing, in whch- Figure l is an elevationof a p-ress pro .vided withthe improvements, viewing the end lof the slide; Fig. 2 is an elevation of the press viewing the side of theslide; Fig. 3 is a side view of the bed and platen with the die and molds; Fig. 4 is a plan of the bed, slide and molds; and Fig. 5 is a vertical section on line 5,-5 in Fig. 3; Fig. 6 is a plan of the platen; Fig. 7 is an elevation of lthe cylinder, platen, and pressing-die, with the arms.of the cylinder broken od; and Fig. 8 is a plan of the die-carrier with its fluid connection.

rllhe press-bed A is shown supported on legs B, and connected. by tie-'bars C to a hydrauliccylinderl), in which .the plunger F is fitted, and provided-with a flat platen F. A return cylinder G is mounted upon the cylinder D, and its ram Gr connected by side rods H with the platen F.

The head D of the cylinder D has a notch d in each side, as shown in Fig. 6, and a washer is laid over each of such notches, as shown in Fig. 7, to sustain a nut, and a rod Z is secured in each notch by lsuch nut and extended downwardly along side of the plunger e, and through the platen. These rods have an enlarged body 0', the lower end of which act as stops between the head D and the platen, totrestrict on limit its upward movement durin the use of the press in molding. (See Fig. 7

Ulhe slide l is fitted movably to a channel li in the bed A, and is moved therein by a rack d and a pinion e provided with a crank f. The molds J and J shown upon the top of the slide, are adapted for molding disk records for reproducing sounds, but the invention is not limited to the use of any special kind of molds. Such molds have one feature especially favorable to the use of the present improvements; namely, a

very shallow mold cavity, which produces a very thin product in the molded article or disk; and this peculiarity of the molds permits their opening with a very small movement of the press-platen, and the discharge of the product from the mold by a limited movement of an ejector.

ln the operation of this apparatus, one mold is withdrawn from beneath theplaten by the act of moving the other under the platen, and the product may thus be ejected annular rflange k2. The molds J and J "are mounted upon similar carriers K which arechambered Vin the same manner, and provided with flexible connections for supplying steam or cold fluid. These two mold-carriers are attached to the slide by screws Z, and are provided in the center with ejectors which are actuated by dogs m when the molds are drawn from beneath the die j. Each ejectorconsists vof atubular plug n fitted to a bore orsocketn. extended through the center of the mold-carrier andthe -slide beneath it, and attached at its lower end to a cross-bar p which extends transversely across the slide. The ends of the cross-bar project from the sides of the slide, and when the slide is pulled acrossthe bed, such ends move over the tops of dogs o, and are pushed upward thereby. The `crow-bar passes througha slot p. v v

The*under sides of the ends, and thetops of the dogs', are sloped sopas to gradually force the cross-bar and ejector upward as the slide reaches the end of its movement;

thus discharging the product s of the molding operation frdmthe'mold when the -I n'old is wholly exposed, as is clearly shown in Fig.

3.. The ejector is shown elevated in Fig. 2,

andthe molded article. removed from the 'Elio to arrest the mold. Fig. 5 shows the article ejected. The disk records formed in such a mold reboss is ormedl in the" center of the mold-l carrier tocenter the mold or pressin die thereon, .and the ejector is formed with a shoulder r which rests'normally upon a shoulder n2 in the bore n', and sets' the top ofthe ejector ush with the top of the boss u during the molding operation.

The boss is made to be Hush with the molding surface of the mold, and theboss and ejector thus form part of the mold bottom during the `nolding operation; the pin 1* alone projecting above such bottom, and

thereby forming the center-hole in the record. The pin is attached at its bottom to a web r4 in the bottom ofthe slide.

The slide and block K are formed with Ventilating passages r2. An upperejector is movable in the center ofthe die, but is held normally retracted by a spring t3, and is projected, when the die is raised from the mold, by a cross-bar t" whlch at such times contacts with the lower ends c of the fixed' I rods b; which ends project below the lower 60 side of the platen for such purpose, as shown in Figs. 3 and 7. The stops c are arranged projected. j

A clearing-pin w is fitted to the bore of the ejector n', and is provided with a ycollar to platen just as the ejector n. is

rest vupon a shoulder t2 in such bore, and with a sprin t* to hold the pin normally projected. .T e pin w `thus extends below the surface of the d1e when the mold is opened, but is pushed up by the pin r as the mold is closed, and moves outward again when the mold is opened, to eject any material crowded therein.

In operating the apparatus, acharge of the plastic material is placed in the mold J orv J, which is set; beneath the die j and the material pressed in the mold; which is heated at -first, and .afterwardchilled to harden the product. The other mold is at the same time charged with the requisite material so .as to be pressed as soon as the first is finished.

The die is then raised bythe action of the ram G', which, in such presses, is supplied constantlyI with fluid under pressure, by pipe h.. The mold thus being opened, the slide is moved to withdraw it and simultaneously set the charged mold beneath the pressing-die. As themold is withdrawn, its ejector 1s actuated by the dogs o, and the product s is lifted from the mold, as shown 1n Fig. 5; so that the operator can remove it before inserting a charge in the mold. By thus charging one mold while the other is pressing, the

capacity of the press is substantially doubled.

It will be understood that the centeringpin 1' is held rigidly upon the slide, and thus pushes the cleaning-pin u upward when the mold is closed and the centeringpin enters thebore of the ejector n; the

lejector n being retracted by the spring t at the same time, so that both are in position to eject the product from the mold when completed. When the mold is opened the cleaning-pin is lforced outward by the spring t4, and cleans out from the bore of the ejector fn. any matter forced therein.

To set the 'molds centrally lbeneath the die, stops 'v are projected upward from the corners of the moldcarriers K in a manner to engage the Shoulder on the outer corner of the die j, and arrest each mold when exactly beneath the-'die T o expedite the molding operation, it 1s desirable to heat and, cool the molds as rapidly as possible, and .special means isprovided to efl'ect that object; the chamber in the mold carrier havin a hub in the center, fromwhich a radia partition v is extended to the side of the carrier through which the heating and cooling fluid are introduced; and'the inlet l and outlet l are connected with the chamber at opposite sides of the partition, so that the -iluid must make a circuit through the entire chamber before itcan escape. y

To promote the rapid circulation of the Huid, three ports 'w are extended-from the chamber for the entering'iluid, and Vthree ports 'w'. for its escape, and a header a: is

aed to the Six ports, and provided with ill- ,136

neoaoeo let and exit pipes l and Z for flexible connections. The header is divided internally,

and the duid entering at Z must therefore pass through the ports w and the circuit of the chamber, to reach the outlet Z.

`From the above description it .will be understood. that all the operations are automatic, when the mold is centered 'beneath the die after the charge isplaced in the mold, as the downward movement of the| platen-lowers the ejector during the` molding operation and raisesit when the mold is moved from beneath the die; and the operators attention may therefore be given entirely to the ill'rg of the molds,

removal of the nished'product. Suitable vcocks are in practice connected to the pipes Z and Z', as well as to pipes 71, and 7b2-from ythe lhydraulic cylinders, but they are not shown, as their use is already well known.

Having thus set forth the nature of tle' and means attached to the press-bed near. l

its opposite ends adapted to operate automatically upon such lifting means to raise the ejector anddisehargethe article from and the tilt the mold, when the carrier is moved int either of its opposite positions.

2. An upright press having a horizontal press-bed, a slide movable across the pressbed, mold-carriers mounted upon the slide near its opposite endshanejector fitted movably to a .bore in the center of each moldcarrier, the slide having a transverse slot intersecting the bore for the ejector, a crossbar movable vertically in the slot, means upon the press-bed operating to lift the cross-bar near the ends of the slides movement to operate the ejector at such time, and a plunger movable to and rom'the press-bed and provided with a platen having a die attached removably thereto and adapted to cooperate with either of the said a molds when moved beneath such die.

3. An upright press having a horizontal press-bed, a plunger having a platen with diel carried thereby and movable to and from the press-bed, a slide movable across the press-bed, mold-carriers and molds mounted upon the slide' near the ends, manual means to shift the slide with either mold beneaththe die, the plunger having a lifting movement sufficient to separate the die widely .from the said mold, fixed bolts eX- tended by the side of the platen, and tubular stops fitted removably Vto the bolts to limit the upward movement of the platen and the resulting movement of the molds.

ln testimony whereof ll have hereunto set my hand.

enteras r. nnnonens. 

